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DEBT (Details) - USD ($) $ / shares in Units, shares in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 13, 2017 | Jan. 23, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 07, 2017
Debt: |  |  |  |  |  |
Settlement Period - Convertible Debt Conversion Request | 40 days |  |  |  |  |
Share Price |  |  | $ 43.02 |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  | 2.5 |  |
Debt Instrument, Convertible, Conversion Value |  |  | $ 200,000 |  |  |
Loss on early extinguishment of debt |  |  | 0 | $ 3,732,000 | $ 0 |
Convertible Senior Notes Due 2022 [Member] |  |  |  |  |  |
Debt: |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 14.9491 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ 66.89 |  |  |  |  |
Debt Instrument, Conversion Obligation Premium on Common Stock | 37.50% |  |  |  |  |
Share Price |  |  |  |  |  | $ 48.65
Debt Redemption Price Due to Fundamental Change as Percentage of Principal Amount | 100.00% |  |  |  |  |
Convertible Debt | $ 274,100,000 |  |  |  |  |
Debt Instrument, Convertible, Assumed Borrowing Rate | 7.45% |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component | $ 70,900,000 |  |  |  |  |
Debt Related Commitment Fees and Debt Issuance Costs | $ 11,000,000 |  |  |  |  |
Debt Issuance Costs, Amortization period | 5 years |  |  |  |  |
Debt Instrument, Customary Events of Default, Percentage of Principal and Accrued and Unpaid Interest Due and Payable Upon Default | 100.00% |  |  |  |  |
Convertible Senior Notes Due 2022 [Member] | Debt Conversion Terms Business Day Immediately Preceding October 1, 2021 [Member] |  |  |  |  |  |
Debt: |  |  |  |  |  |
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum, Number of Trading Days | 20 days |  |  |  |  |
Debt Instrument, Conversion Obligation Number of Consecutive Trading Days | 30 days |  |  |  |  |
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum as Percentage of Conversion Price | 130.00% |  |  |  |  |
Debt Instrument Conversion Obligation Number of Consecutive Business Days after Consecutive Trading Day Period | 5 days |  |  |  |  |
Debt Instrument, Conversion Obligation Period of Consecutive Trading Days | 5 days |  |  |  |  |
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock | $ 1,000 |  | 1,000 |  |  |
Debt Instrument, Conversion Obligation Trading Price as Percentage of Product of Last Reported Common Stock Sale Price and Conversion Rate Maximum | 98.00% |  |  |  |  |
Debt Instrument, Market Price |  |  | $ 998 |  |  |
Convertible Senior Notes Due 2022 [Member] | Debt Redemption Terms on or after April 1, 2020 [Member] |  |  |  |  |  |
Debt: |  |  |  |  |  |
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum, Number of Trading Days | 20 days |  |  |  |  |
Debt Instrument, Conversion Obligation Number of Consecutive Trading Days | 30 days |  |  |  |  |
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum as Percentage of Conversion Price | 130.00% |  |  |  |  |
Debt Instrument Conversion Obligation Number of Trading Days Prior to Date on which Entity Provides Notice of Redemption | 5 days |  |  |  |  |
Debt Instrument, Percentage of Principal Amount for Computation of Redemption Price | 100.00% |  |  |  |  |
Convertible debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.25% | 3.25% |  |  |
Debt: |  |  |  |  |  |
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock | $ 1,000 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  | $ 24.82 |  |  |
Gross Proceeds From Issuance of Debt |  | $ 120,000,000 |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | 118,200,000 |  |
Unsecured Debt | Convertible Senior Notes Due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 345,000,000 | 345,000,000 |  |
Proceeds from Issuance of Debt | $ 345,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.375% |  |  |  |  |
Debt: |  |  |  |  |  |
Debt Issuance Costs, Net |  |  | (5,850,000) | (7,482,000) |  |
Discount on debt |  |  | (48,558,000) | (61,345,000) |  |
Total debt, net of debt discount |  |  | 290,592,000 | 276,173,000 |  |
Proceeds from Convertible Debt, Net | $ 334,000,000 |  |  |  |  |
Unsecured Debt | Convertible debt |  |  |  |  |  |
Debt: |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 338,000 | $ 338,000 |  |

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- Definition Represents the maximum percentage of the trading price of each debt instrument to the product of the last reported sale price of the entity's common stock and the conversion rate of the debt instrument that the trading price must be less than in order for the debt instruments to be convertible. + References No definition available. + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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